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Acoustic Data Compression -- MP3 Base Patent
Commemorate Banana Union Day

Iteratively perform certain calculations on acoustic data until a certain value is reached. The patent owner Karlheinz Brandenburg, core researcher of the MP3 project at Max Planck, received this patent in 1989. This patent and its owner were showcased by the European Commission's "IPR Helpdesk" project in 2001 as "inventor of the month". This is one of several dozen patents which cover the MP3 audio compression standard, and perhaps the most famous and basic one. It has always been treated as a model of how "technical" and "non-trivial" software patents can get.
Claim 1:
Digital coding process for transmitting and/or storing acoustic signals, specifically music signals, comprising the following steps.
  • N samples of the acoustic signal are converted into M spectral coefficients;
  • said M spectral coefficients are subjected to quantisation at a first level;
  • after coding by means of an entropic encoder the number of bits required to represent all the quantized spectral coefficients is checked;
  • when the required number of bits does not correspond to a specified number of bits quantization and coding are repeated in subsequent steps, each at a modified quantization level, until the number of bits required for representation reaches the specified number of bits, and
  • additionally to the data bits the required quantization level is transmitted and/or stored.
patent application (A):
claims, description and abstract
granted version (B1):
The EPO publishes the patent as a collection of graphical files, which we concatenate into one huge PDF file and, by OCR batch processing, reduce to a text file.
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